Growth and Yield of Okra with Rock-Phosphate – Amended Organic Fertilizer

Eyitayo A. Makinde

Abstract


Phosphorous supply from organic manures for okra production can be insufficient for optimal fruit yield. The growth and yield of okra (Variety: NHAe 47-4) were assessed in field experiments with an organic fertilizer made from cowdung (CD), fortified with Ogun Rock Phosphate (ORP). The ORP was applied sole at 100 kg ha-1 and also with each of 2.5; 5.0; 7.5 and 10.0 t ha-1 cowdung. There was a standard check of NPK 20-10-10 applied 2 weeks after planting at 400 kg ha-1 and an unfertilized control., Average number of leaves per plant, stem diameter and plant height were all similar, with 4 weeks growth. Average plant leaf area was however higher with ORP added to either 7.5 or 10.0 t ha-1 CD, relative to either sole ORP or the unfertilized treatments. At 8 weeks after planting, plant height was highest with 10.0 t ha-1 CD + ORP and was comparable only with plants from 7.5 t ha-1 CD + ORP application. Plant stem girths were similar with all ORP applications. Number of leaves per plant and average leaf area were highest with 10.0 t ha-1 CD + ORP. Applications of 2.5; 5.0 and 7.5 t ha-1 CD + ORP had comparable leaf areas. Application of 10.0 t ha-1 CD + ORP gave the highest okra fruit yield which was comparable with yields from 2.5; 5.0 and 7.5 t ha-1 CD +ORP that ranged from 2.92 to 3.05 t ha-1. Pod length and pod circumference were significantly higher with ORP + 10.0 or 7.5 t ha-1 CD. Plants from the unfertilized control treatment had significantly shorter pods with lower circumference than all the fertilized plants. Okra fruit yield is significantly increased with organic fertilizer fortification with ORP.

Full Text: PDF DOI: 10.5539/jas.v5n10p221

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Journal of Agricultural Science ISSN 1916-9752 (Print) ISSN 1916-9760 (Online)

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